TW201504679A - Lens module and light source module with the lens module - Google Patents

Abstract

A lens module used for adjusting ray of a light source includes a first lens and a second lens. A accommodate groove is formed on the second lens. The first lens is set in the accommodate groove, and contacts with a surface of the accommodate groove. A refractivity of the second lens is less than a refractivity of the first lens. The ray of the light source emits to an outside through the first lens and the second lens. The invention also provides a light source module applying the lens module.

Description

Lens module and light source module using the same

The invention relates to a lens module and a light source module using the lens module.

Compared with the traditional illumination source, the Light Emitting Diode (LED) has the advantages of light weight, small volume, low pollution and long life. It has been widely used as a new type of illumination source. . For example, the light source of the backlight module of the previous display is gradually replaced by a light-emitting diode.

In the prior art, the backlight module is usually a direct type, and the direct type backlight module is further provided with a light-emitting element above the light-emitting diode in order to reduce the use of the light-emitting diode. The divergence angle of the body expands. However, the conventional light-expanding element usually adopts a single lens. Since the difference between the refractive index of the lens and the air is large, the phenomenon of total reflection is easily caused at the boundary of the lens, thereby reducing the light source module. Light extraction efficiency.

In view of the above, it is necessary to provide a lens module having a large light exit angle and high light extraction efficiency and a light source module using the lens module.

A lens module for adjusting light emitted by a light source. The lens module includes a first lens and a second lens. A receiving slot is formed on the second lens, and the first lens is received in the receiving slot and is in contact with the surface of the receiving slot. The refractive index of the second lens is smaller than the refractive index of the first lens. The light emitted by the light source is sequentially emitted to the outside through the first lens and the second lens.

A light source module includes a light source and the lens described above.

The above lens module adopts two kinds of lenses with different refractive indexes. Compared with the conventional single lens structure, the present invention provides a second lens having a lower refractive index outside the first lens having a higher refractive index, thereby greatly reducing the total number of lenses. The probability of emission is increased, thereby increasing the light extraction efficiency. In addition, since the refractive index of the second lens is smaller than the refractive index of the first lens, the light can be further deflected toward the lateral direction of the lens module, thereby further increasing the light exit angle.

10‧‧‧Light source module

100‧‧‧ lens module

200‧‧‧Light source

110‧‧‧first lens

120‧‧‧second lens

111‧‧‧First light entry

112‧‧‧The first glazing

113, 123‧‧‧ bottom

114, 124‧‧‧ side

121‧‧‧Second entrance

122‧‧‧Second glazing

125‧‧‧ Reception trough

1121‧‧‧ concave

1122‧‧ ‧ convex

FIG. 1 is a schematic perspective structural view of a light source module according to an embodiment of the present invention.

2 is a cross-sectional view of the light source module of FIG. 1 taken along the II-II direction.

3 is a schematic exploded view of the lens module of the light source module of FIG. 1.

4 is an exploded perspective view showing another angle of the lens module of FIG. 3.

Figure 5 is a cross-sectional view of the first lens of the lens module of Figure 3 taken along the line V-V.

6 is a cross-sectional view of the second lens of the lens module of FIG. 3 taken along line VI-VI.

Referring to FIG. 1 and FIG. 2 , a light source module 10 according to an embodiment of the present invention includes a lens module 100 and a light source 200 disposed in the lens module 100 .

Referring to FIG. 3 to FIG. 6 , the lens module 100 has a cylindrical body as a whole, and includes a first lens 110 and a second lens 120 . The first lens 110 is disposed in the second lens 120.

The first lens 110 includes a first light incident surface 111 , a first light exit surface 112 , a bottom surface 113 , and a side surface 114 . The bottom surface 113 is a circular plane. The first light incident surface 111 is a curved surface which is recessed from the center of the bottom surface 113 toward the inside of the first lens 110. The central axis of the first light incident surface 111 coincides with the central axis of the lens module 100. In the present embodiment, the contour of the first light incident surface 111 is substantially an ellipsoidal surface, the short axis of which is located on the plane of the bottom surface 113, and the long axis is perpendicular to the bottom surface 113.

The first light-emitting surface 112 is correspondingly located above the first light-incident surface 111 . The first light-emitting surface 112 is an aspherical surface, and includes a concave surface 1121 at the center of the top and a convex surface 1122 at the periphery of the concave surface 1121. The concave surface 1121 is opposite to the first light incident surface 111 and is recessed toward the first light incident surface 111 for diverging the forward light reaching the concave surface 1121. The convex surface 1122 is a curved surface that protrudes outward toward the bottom surface 113. The convex surface 1122 is smoothly connected to the concave surface 1121.

The side surface 114 extends vertically upward from the edge of the bottom surface 113 and is connected to the edge of the first light-emitting surface 112. The side surface 114 is cylindrical and has a center on the optical axis of the lens module 100.

The second lens 120 includes a second light incident surface 121 , a second light exit surface 122 , a bottom surface 123 , and a side surface 124 . The bottom surface 123 is a circular plane. The second lens 120 is recessed from the middle of the bottom surface 123 to form a receiving groove 125. The surface of the receiving groove 125 forms the second light incident surface 121. The shape of the second light-incident surface 121 is the same as that of the first light-emitting surface 112 and the side surface 114 of the first lens 110, so that when the first lens 110 is received in the receiving groove 125, the first light-emitting surface 112 of the first lens 110 The side surface 114 can completely fit on the second light incident surface 121 of the second lens 120. The second light exiting surface 122 is a circular plane parallel to the bottom surface 123, and its center is located on the optical axis of the lens module 100. The side surface 124 extends vertically upward from the edge of the bottom surface 123 and is connected to the edge of the second light exit surface 122. The side surface 124 is cylindrical and has a center on the optical axis of the lens module 100.

The first lens 110 is received in the receiving groove 125 of the second lens 120, and the first light emitting surface 112 and the side surface 114 of the first lens 110 are completely adhered to the second light incident surface 121 of the second lens 120, and The bottom surface 113 of the first lens 110 and the bottom surface 123 of the second lens 120 are on the same plane, so that the combined lens module 100 forms a cylindrical shape.

The first lens 110 and the second lens 120 are respectively made of different materials, wherein the refractive index of the material of the first lens 110 is greater than the refractive index of the material of the second lens 120. In the present embodiment, the refractive index of the first lens 110 is 1.8, which is composed of an optical grade glass material, and the refractive index of the second lens 120 is 1.5, which is composed of polymethylmethacrylate (PMMA).

The light source 200 is disposed in a space surrounded by the first light incident surface 111 of the first lens 110. In the embodiment, the light source 200 is a light emitting diode.

Referring to FIG. 2 , when the light source module 10 is in use, the light emitted by the light source 200 first enters the first lens 110 from the first light incident surface 111 of the first lens 110 , wherein the light source 200 emits positive light. After the concave surface 1121 of the first lens 110 is diverged toward the two sides, it is emitted through the second lens 120; when the lateral light emitted from the light source 200 enters the second lens 120 from the first lens 110, the refractive index of the first lens 110 is obtained. The refractive index of the second lens 120 is greater than that of the second lens 120, so that the total emission can be avoided at the peripheral portion of the first lens 110, thereby improving the light extraction efficiency of the light source module 10. In addition, since the refractive index of the first lens 110 is larger than that of the second lens The refractive index of 120 can further deflect laterally toward the lens module 100, thereby further increasing the light exit angle of the light source module 10.

no

10‧‧‧Light source module

100‧‧‧ lens module

200‧‧‧Light source

110‧‧‧first lens

120‧‧‧second lens

111‧‧‧First light entry

113, 123‧‧‧ bottom

114, 124‧‧‧ side

122‧‧‧Second glazing

1121‧‧‧ concave

1122‧‧ ‧ convex

Claims (8)

A lens module for adjusting light emitted by a light source, wherein the lens module comprises a first lens and a second lens, wherein the second lens forms a receiving groove, and the first lens receives And the second lens has a refractive index smaller than a refractive index of the first lens, and the light emitted by the light source sequentially passes through the first lens and the second lens to the outside. . The lens module of claim 1, wherein: the first lens comprises a first light incident surface, a first light emitting surface, a bottom surface and a side surface, and the first light incident surface is a center of the bottom surface a curved surface that is recessed toward the inside of the first lens, the first light-emitting surface is located above the first light-incident surface, and the side surface connects the bottom surface and the first light-emitting surface. The lens module of claim 2, wherein: the first light-emitting surface of the first lens comprises a concave surface at a center of the top portion and a convex surface at a periphery of the concave surface, the concave surface facing the first light-incident surface The direction is recessed, and the convex surface is convex outward in a direction away from the first light incident surface. The lens module of claim 2, wherein: the first light-emitting surface and the side surface of the first lens have the same shape as the receiving groove of the second lens, and the first light of the first lens The surface and the side surface are fitted to the surface of the receiving groove. The lens module of claim 4, wherein: the second lens comprises a second light-incident surface, a second light-emitting surface, a bottom surface and a side surface, wherein the bottom surface is a plane, and the receiving groove is a central portion of the bottom surface is recessed inwardly, the surface of the receiving groove forms the second light incident surface, the second light emitting surface is a plane parallel to the bottom surface, and the side surface connects the bottom surface and the second light emitting surface, the second The bottom surface of the lens is on the same plane as the bottom surface of the first lens. The lens module of claim 1, wherein: the first lens is made of an optical grade glass material, and the second lens is made of a polymethyl methacrylate material. A light source module comprising a light source and a lens according to any one of claims 1-6. The light source module of claim 7, wherein the light source is a light emitting diode, and the light emitting diode is disposed in the first lens.